71 lines
1.5 KiB
TypeScript
71 lines
1.5 KiB
TypeScript
import { Bet } from './bet'
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import { calculateShareValue, deductFees, getProbability } from './calculate'
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import { Contract } from './contract'
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import { CREATOR_FEE } from './fees'
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import { User } from './user'
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export const getSellBetInfo = (
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user: User,
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bet: Bet,
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contract: Contract,
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newBetId: string
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) => {
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const { pool, totalShares, totalBets } = contract
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const { id: betId, amount, shares, outcome, loanAmount } = bet
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const adjShareValue = calculateShareValue(contract, bet)
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const newPool = { ...pool, [outcome]: pool[outcome] - adjShareValue }
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const newTotalShares = {
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...totalShares,
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[outcome]: totalShares[outcome] - shares,
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}
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const newTotalBets = { ...totalBets, [outcome]: totalBets[outcome] - amount }
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const probBefore = getProbability(totalShares)
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const probAfter = getProbability(newTotalShares)
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const profit = adjShareValue - amount
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const creatorFee = CREATOR_FEE * Math.max(0, profit)
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const saleAmount = deductFees(amount, adjShareValue)
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console.log(
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'SELL M$',
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amount,
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outcome,
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'for M$',
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saleAmount,
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'creator fee: M$',
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creatorFee
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)
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const newBet: Bet = {
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id: newBetId,
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userId: user.id,
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contractId: contract.id,
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amount: -adjShareValue,
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shares: -shares,
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outcome,
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probBefore,
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probAfter,
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createdTime: Date.now(),
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sale: {
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amount: saleAmount,
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betId,
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},
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}
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const newBalance = user.balance + saleAmount - (loanAmount ?? 0)
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return {
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newBet,
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newPool,
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newTotalShares,
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newTotalBets,
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newBalance,
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creatorFee,
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}
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}
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